Batches

train_model.py

@@ -4,16 +4,16 @@ import numpy as np
 import cv2
 import argparse
 import tensorflow as tf
-from video_compression_model import NUM_CHANNELS, VideoCompressionModel, PRESET_SPEED_CATEGORIES
+from video_compression_model import NUM_CHANNELS, VideoCompressionModel, PRESET_SPEED_CATEGORIES, VideoDataGenerator
 from tensorflow.keras.callbacks import EarlyStopping, ModelCheckpoint
 
 print("GPUs Detected:", tf.config.list_physical_devices('GPU'))
 
 # Constants
-BATCH_SIZE = 16
+BATCH_SIZE = 4
-EPOCHS = 40
+EPOCHS = 100
-LEARNING_RATE = 0.00001
+LEARNING_RATE = 0.000001
-TRAIN_SAMPLES = 100
+TRAIN_SAMPLES = 500
 MODEL_SAVE_FILE = "models/model.tf"
 MODEL_CHECKPOINT_DIR = "checkpoints"
 CONTINUE_TRAINING = None
@@ -23,14 +23,14 @@ def load_list(list_path):
         video_details_list = json.load(json_file)
     return video_details_list
 
-def load_video_from_list(list_path):
+def load_video_from_list(list_path, samples = TRAIN_SAMPLES):
     details_list = load_list(list_path)
     all_details = []
 
     num_videos = len(details_list)
-    frames_per_video = int(TRAIN_SAMPLES / num_videos)
+    frames_per_video = int(samples / num_videos)
     
-    print(f"Loading {frames_per_video} across {num_videos} videos")
+    print(f"Loading {frames_per_video} frames across {num_videos} videos")
 
     for video_details in details_list:
         VIDEO_FILE = video_details["video_file"]
@@ -108,26 +108,10 @@ def main():
     print(f"Continue training from: {CONTINUE_TRAINING}")
     
     all_video_details_train = load_video_from_list("test_data/training.json")
-    all_video_details_val = load_video_from_list("test_data/validation.json")
+    all_video_details_val = load_video_from_list("test_data/validation.json", TRAIN_SAMPLES / 2)
 
-    all_train_frames = [video_details["frame"] for video_details in all_video_details_train]
+    train_generator = VideoDataGenerator(all_video_details_train, BATCH_SIZE)
-    all_train_compressed_frames = [video_details["compressed_frame"] for video_details in all_video_details_train]
+    val_generator = VideoDataGenerator(all_video_details_val, BATCH_SIZE)
-    all_val_frames = [video_details["frame"] for video_details in all_video_details_val]
-    all_val_compressed_frames = [video_details["compressed_frame"] for video_details in all_video_details_val]
-    all_crf_train = [video_details['crf'] for video_details in all_video_details_train]
-    all_crf_val = [video_details['crf'] for video_details in all_video_details_val]
-    all_preset_speed_train = [video_details['preset_speed'] for video_details in all_video_details_train]
-    all_preset_speed_val = [video_details['preset_speed'] for video_details in all_video_details_val]
-
-    # Convert lists to numpy arrays
-    all_train_frames = np.array(all_train_frames)
-    all_train_compressed_frames = np.array(all_train_compressed_frames)
-    all_val_frames = np.array(all_val_frames)
-    all_val_compressed_frames = np.array(all_val_compressed_frames)
-    all_crf_train = np.array(all_crf_train)
-    all_crf_val = np.array(all_crf_val)
-    all_preset_speed_train = np.array(all_preset_speed_train)
-    all_preset_speed_val = np.array(all_preset_speed_val)
     
     if CONTINUE_TRAINING:
         print("loading model:", CONTINUE_TRAINING)
@@ -154,11 +138,11 @@ def main():
 
     print("\nTraining the model...")
     model.fit(
-        {"uncompressed_frame": all_train_frames, "compressed_frame": all_train_compressed_frames, "crf": all_crf_train, "preset_speed": all_preset_speed_train},
+        train_generator,
-        all_train_compressed_frames,  # Target is the compressed frame
+        steps_per_epoch=len(train_generator),
-        batch_size=BATCH_SIZE,
         epochs=EPOCHS,
-        validation_data=({"uncompressed_frame": all_val_frames, "compressed_frame": all_val_compressed_frames, "crf": all_crf_val, "preset_speed": all_preset_speed_val}, all_val_compressed_frames),
+        validation_data=val_generator,
+        validation_steps=len(val_generator),
         callbacks=[early_stop, checkpoint_callback]
     )
     print("\nTraining completed!")

video_compression_model.py

@@ -1,11 +1,37 @@
 # video_compression_model.py
 
+import numpy as np
 import tensorflow as tf
 
 PRESET_SPEED_CATEGORIES = ["ultrafast", "superfast", "veryfast", "faster", "fast", "medium", "slow", "slower", "veryslow"]
 NUM_PRESET_SPEEDS = len(PRESET_SPEED_CATEGORIES)
 NUM_CHANNELS = 3
 
+class VideoDataGenerator(tf.keras.utils.Sequence):
+    def __init__(self, video_details_list, batch_size):
+        self.video_details_list = video_details_list
+        self.batch_size = batch_size
+
+    def __len__(self):
+        return int(np.ceil(len(self.video_details_list) / float(self.batch_size)))
+
+    def __getitem__(self, idx):
+        start_idx = idx * self.batch_size
+        end_idx = (idx + 1) * self.batch_size
+        
+        batch_data = self.video_details_list[start_idx:end_idx]
+
+        x1 = np.array([item["frame"] for item in batch_data])
+        x2 = np.array([item["compressed_frame"] for item in batch_data])
+        x3 = np.array([item["crf"] for item in batch_data])
+        x4 = np.array([item["preset_speed"] for item in batch_data])
+
+        y = x2
+
+        inputs = {"uncompressed_frame": x1, "compressed_frame": x2, "crf": x3, "preset_speed": x4}
+        return inputs, y
+
+
 class VideoCompressionModel(tf.keras.Model):
     def __init__(self):
         super(VideoCompressionModel, self).__init__()
@@ -64,8 +90,13 @@ class VideoCompressionModel(tf.keras.Model):
 
         # Integrate the CRF and preset speed information into the frames as additional channels (features)
         _, height, width, _ = uncompressed_frame.shape
+        current_shape = tf.shape(inputs["uncompressed_frame"])
+        
+        height = current_shape[1]
+        width = current_shape[2]
         integrated_info_repeated = tf.tile(tf.reshape(integrated_info, [-1, 1, 1, 32]), [1, height, width, 1])
 
+
         # Merge uncompressed and compressed frames
         frames_merged = tf.keras.layers.Concatenate(axis=-1)([uncompressed_frame, compressed_frame, integrated_info_repeated])